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Jamshidi Fariba,Gholivand Mohammad-Bagher,Amiri Masoud 한국물리학회 2022 Current Applied Physics Vol.37 No.-
Here, we report on a facile green and scalable method for the fabrication of porous 3D graphene as a well-known carbon-based material used in many energy storage devices. Chicken red blood cells were used as sheets spacer and heteroatom sources in the construction of 3D graphene. First, the red blood cells were separated from the blood and mixed with graphene oxide. Then, the mixture was freeze-dried and carbonized at 700 ◦C. The resulted 3D graphene containing heteroatoms was used as a supercapacitor electrode modifier on a glassy carbon electrode and tested with various electrochemical techniques. The supercapacitor electrode showed a specific capacitance of 330 F g-1 at a current density of 1 A g-1, maximum power density of 1958 W kg-1, and maximum energy density of 85 Wh kg-1. Furthermore, the supercapacitive performances were tested in a two-electrode symmetrical system which exhibited a specific capacitance of 238 F g-1 for 1 A g-1. It also showed a power density of 2200 W kg-1 and an appreciable energy density of 160 Wh kg-1. The excellent electrochemical behavior of 3D graphene indicates the promising abilities of the composite for other applications such as biosensors, batteries, electrocatalysts, etc.
Catalytic performance and characterization of cobalt-nickel nano catalysts for CO hydrogenation
Mostafa Feyzi,Arash Babakhanian,Mohammad Bagher Gholivand 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.1
A series of Co-Ni nano catalysts were prepared by co-precipitation method. We investigated the effect of Co/Ni molar ratios precipitate and calcination conditions on the catalytic performance of cobalt nickel catalysts for Fisher-Tropsch synthesis (FTS). The catalyst containing 90%Co/10%Ni was found to be optimal for the conversion of synthesis gas to light olefins. The activity and selectivity of the optimal catalyst were studied in different operational conditions. The results show that the best operational conditions are the H2/CO=2/1 molar feed ratio at 310 oC and GHSV=1,200 h−1 under 5 bar of pressure. The prepared catalysts were characterized by powder X-ray diffraction (XRD),N2 adsorption-desorption measurements such as BET and BJH methods, transmission electron microscopy (TEM) and thermal gravimetric analysis (TGA).